The Dental cosmos . Mrs. M., thirty-six years of age. Anappliance was inserted in the lower archto open the bite and move the incisors in-ward, and another one inserted in theupper arch for moving the incisors andcanines outward. Another similar case, that of a girlthirteen years of age, is illustrated inFigs. 21 and 22. In concluding my paper, I will briefly JACKSON.—0 BT JIODO N T1A. 353 describe an interesting case of progna-thism in a child aged two years and tenmonths. (Fig. 23.) The mandible was very prom incut, theincisors and canines touching the gum infront of the upper ones when in o
The Dental cosmos . Mrs. M., thirty-six years of age. Anappliance was inserted in the lower archto open the bite and move the incisors in-ward, and another one inserted in theupper arch for moving the incisors andcanines outward. Another similar case, that of a girlthirteen years of age, is illustrated inFigs. 21 and 22. In concluding my paper, I will briefly JACKSON.—0 BT JIODO N T1A. 353 describe an interesting case of progna-thism in a child aged two years and tenmonths. (Fig. 23.) The mandible was very prom incut, theincisors and canines touching the gum infront of the upper ones when in occlu-sion. The upper incisors needed to bemoved outward, requiring the opening ofthe bite. The irregularity was success-fully corrected by the application of asmall metal inclined plane. The inclined Fig. plane pointing backward was attached tothe incisors and canines of the lower arch.(Fig. 24.) This had the effect of open-ing the bite and at the same time offorcing the jaws and teeth of the lowerarch inward, and the teeth of the upperarch outward. The inclined plane was made by join-ing two pieces of plate geld. A piece ofsoft wax was first molded on the lingualside of a cast of the lower incisors andcanines, the surface of the wax beingshaped to project upward and backwardin the form required for the inclinedplane. An impression w;1s then taken ofthe labial faces of the incisors and ca- VOL. XLIX.—27 nines, including the front and upper sur-face of the wax. From this impression adie and counter-die were made of fusiblemetal. A piece of gold plate was thenswaged to fit the parts forming the frontof the incline. The wax was then re-moved from the lingual side of the teeth,the plate of gold being held in proper po-sition while another impression of the lin-gual side of the teeth and
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